25640958 has 32 divisors (see below), whose sum is σ = 59417856. Its totient is φ = 7224768.

The previous prime is 25640957. The next prime is 25640977. The reversal of 25640958 is 85904652.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116 + ... + 7247.

It is an arithmetic number, because the mean of its divisors is an integer number (1856808).

Almost surely, 2^25640958 is an apocalyptic number.

25640958 is an abundant number, since it is smaller than the sum of its proper divisors (33776898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25640958 is a wasteful number, since it uses less digits than its factorization.

25640958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8448.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 25640958 is about 5063.6901563978. The cubic root of 25640958 is about 294.8796138105.

It can be divided in two parts, 256 and 40958, that added together give a palindrome (41214).

The spelling of 25640958 in words is "twenty-five million, six hundred forty thousand, nine hundred fifty-eight".